SlMKK4 is responsible for pollen development in tomato.

The development of viable pollen is a determinant of male fertility and plays an essential role in the reproductive process of angiosperms. Mitogen-activated protein kinase (MAPK) cascades modulate diverse aspects of plant growth, but their involvement in post-meiotic pollen development is unclear. In this study, SlMKK4 was identified as a crucial regulator in overseeing pollen development in tomatoes (Solanum lycopersicum).